RFR: JDK-8072725: Provide more granular levels for GC verification

Jon Masamitsu jon.masamitsu at oracle.com
Tue Dec 22 15:43:52 UTC 2015

On 12/21/2015 4:40 PM, Poonam Bajaj Parhar wrote:
> Hello Jon,
> On 12/21/2015 2:29 PM, Jon Masamitsu wrote:
>> Poonam,
>> Some of the string list parameters allow separation by , or " ".  Did
>> you consider adding that?
> The VerifySubSet string list can accept the strings separated by comma 
> or a space. Before verification, we just need to check if a particular 
> subset is present in the VerifySubSet list or not. We don't need any 
> complicated processing of the strings list here.

Ok.  Thanks for the explanation.

You mention in the RFR that you have a simple test to test the
change.  Can you add that as a jtreg test?  I'm thinking about
something like



> Thanks,
> Poonam
>> Jon
>> PS. See share/vm/compiler/compilerDirectives.cpp
>> ccstrlist DirectiveSet::canonicalize_disableintrinsic(ccstrlist 
>> option_value)
>> On 12/15/2015 03:15 PM, Poonam Bajaj Parhar wrote:
>>> Hello,
>>> Please review these changes that split up the work done under 
>>> Verify*GC options. This will be very useful in debugging GC 
>>> issues/crashes where verifying the whole memory system with 
>>> Verify*GC options slows down the process and makes it impossible to 
>>> reproduce the problem.
>>> The changes introduce a new option /VerifySubSet///that can be used 
>>> to specify the specific memory sub-systems that one wants to verify. 
>>> It can be one or more of the sub-systems from these: threads, heap, 
>>> symbol_table, string_table, codecache, dictionary, 
>>> classloader_data_graph, metaspace, jni_handles,  c-heap and 
>>> codecache_oops. If nothing is specified with /VerifySubSet/ then 
>>> whole of the memory system is verified with Verify*GC options.
>>> Bug:JDK-8072725: <https://bugs.openjdk.java.net/browse/JDK-8072725> 
>>> Provide more granular levels for GC verification
>>> Webrev: http://cr.openjdk.java.net/~poonam/8072725/webrev.00/
>>> Testing: JPRT, tested the changes with a simple test program.
>>> Thanks,
>>> Poonam

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